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Horine is an unincorporated community and census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 821 at the 2010 census, down from 923 in 2000.
Horine was platted in 1868, and named after C. Thomas Horine, an early settler. A post office called "Horine Station" was established in 1862, the name was changed to "Horine" in 1916, and the post office closed in 1942.
Horine is located in eastern Jefferson County at 38°15′58″N 90°25′49″W (38.266140, -90.430290). It is bordered to the northeast by the city of Pevely, to the northwest by Route Z, and to the south by Joachim Creek, a direct tributary of the Mississippi River.
According to the United States Census Bureau, the Horine CDP has a total area of 0.76 square miles (1.96 km2), of which 0.75 square miles (1.94 km2) are land and 0.01 square miles (0.02 km2), or 0.98%, are water. The CDP area has decreased slightly since 2000, due to some annexation by the city of Pevely.
As of the census of 2000, there were 923 people, 335 households, and 254 families residing in the CDP. The population density was 1,112.2 people per square mile (429.4/km2). There were 355 housing units at an average density of 427.8/sq mi (165.1/km2). The racial makeup of the CDP was 97.83% White, 0.87% African American, 0.22% Native American, 0.11% Asian, and 0.98% from two or more races.